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Related Experiment Videos

Vestibular suppression during space flight.

Douglas Watt1, Luc Lefebvre

  • 1Aerospace Medical Research Unit, McGill University, 3655 Prom. Sir William Osler, Montreal, Quebec, Canada H3G 1Y6. doug.watt@mcgill.ca

Journal of Vestibular Research : Equilibrium & Orientation
|April 21, 2004
PubMed
Summary
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Astronauts may experience space motion sickness due to increased vestibular suppression during head movements. This vestibular suppression, observed in early spaceflight, could trigger motion sickness on Earth.

Area of Science:

  • Neuroscience
  • Space Medicine
  • Human Physiology

Background:

  • Voluntarily fixing the head during normal movements can induce motion sickness by suppressing vestibular responses.
  • This motor strategy is common in early spaceflight and may cause space motion sickness.

Purpose of the Study:

  • To investigate the role of vestibular suppression in space motion sickness.
  • To analyze head and eye movements in astronauts during the initial phase of space missions.

Main Methods:

  • Monitored eye, head, and upper torso rotations of four astronauts during pure yaw-axis head movements.
  • Excluded data not pertaining to yaw-axis head movements.

Main Results:

  • A significant increase in gaze slip was observed on the first day of spaceflight.
Keywords:
NASA Discipline NeuroscienceNon-NASA Center

Related Experiment Videos

  • This indicates increased vestibular suppression in astronauts.

    • Conclusions:

    • The observed vestibular suppression levels are sufficient to cause motion sickness in susceptible individuals.
    • Results support a theory of two independent mechanisms contributing to space motion sickness.